Numbers k such that k * phi(k) is a fifth power.

Terms

a(0) =1a(1) =8a(2) =256a(3) =500a(4) =864a(5) =8192a(6) =9826a(7) =16000a(8) =27648a(9) =54000a(10) =132651a(11) =209952a(12) =246924a(13) =262144a(14) =314432a(15) =333396a(16) =512000a(17) =884736a(18) =1061208a(19) =1562500a(20) =1728000a(21) =6718464a(22) =7002306a(23) =7294032a(24) =7901568a(25) =8388608a(26) =8541936a(27) =10061824a(28) =10668672a(29) =13122000